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CVE-2026-43262: gfs2: fiemap page fault fix

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: fiemap page fault fix In gfs2_fiemap(), we are calling iomap_fiemap() while holding the inode glock. This can lead to recursive glock taking if the fiemap buffer is memory mapped to the same inode and accessing it triggers a page fault. Fix by disabling page faults for iomap_fiemap() and faulting in the buffer by hand if necessary. Fixes xfstest generic/742.

Affected products

• Linux kernel: from 2.6.29 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 — fixed in 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6, 6.6.128

How to fix

Upgrade to a fixed version: Linux kernel 5.15.202, 6.1.165, 6.12.75, 6.18.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2e121c53b581e40397ae08090a7af4ed10781fbc
• https://git.kernel.org/stable/c/5d2c4f182ea8516de8682e2b60411c03df00e3ea
• https://git.kernel.org/stable/c/5d5d9ec957bfa1eb2b05861c19f5d701dd006db7
• https://git.kernel.org/stable/c/9d15fee888f0e8938c9aeed71ec9c2cbba0c88ab
• https://git.kernel.org/stable/c/cead3bebf3e318578b8a86a5472015d713d2a8a8
• https://git.kernel.org/stable/c/e411d74cc5ba290f85d0dd5e4d1df8f1d6d975d2
• https://git.kernel.org/stable/c/e428670cfb2993d8c224effd076242ca6b0950de

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